Here's some of my feedback after tuning a few MK3's with SAFC's.
Before you dyno, you will want to adjust your lexus screw so that the vf reference on the TCCS diagnostics block is putting out a 2.50v. If you want to read about it, you can visit this website:
http://suprasonic.org/lexusriemer/lexusnote.html (note, website is slow)
I usually tune the vf while cruising down the highway.
For throttle points, I set mine for 79%Lo and 80%Hi, also, don't adjust fuel below 3000rpm since the ECU is still trying to adjust below that rpm. On the dyno, just adjust the Hi Throttle settings.
I would shoot for 11.5:1 a/f since once you put the car back on the road and full load it will run even more lean. Depending on the dyno and how much load it applies, lowerer a/f for less inertia, higher a/f for high inertia. On a dynojet, another .5 a/f since on a colder day you will run leaner (colder intake temps and higher IC efficiency=more dense air), if it's over 75, shoot for 11:1, if it's under, shoot for 11.5:1. I've seen cars tuned in August in 90 degree weather hitting 11.5:1, then in November when it's in the 40-50's high 12.5:1 with the same settings.
Hope that helps.
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Joseph Schesso
Extreme Turbo Systems
PacNW Supras Portland/Metro Event Coordinator